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A nickel-iron-chromium alloy called Carpenter 20, called Alloy 20, was made to be the most resistant to acid attack, especially sulfuric acid. Alloy 20 is also called Carpenter 20. In chemicals that contain chlorides, sulfuric, phosphoric, and nitric acids, this superalloy is very resistant to corrosion in general, as well as pitting, crevice corrosion, and corrosion in small places. It also has niobium in it to keep it from becoming sensitive and causing intergranular corrosion.

Nickel alloy 20 is a low-carbon austenitic nickel/iron/chromium alloy stabilised with niobium and containing molybdenum and copper. It is a low-carbon austenitic nickel/iron/chromium alloy. Phosphoric acid, nitric acid, chloride salts, and sulfuric acid are among the chemical environments in which it is extremely corrosion resistant. Also of note is that it has favourable mechanical properties at both low and high temperatures.

Chemical Analysis :

The chemical composition nickel alloy 20 is outlined in the following table.

Element Iron, Fe Nickel, Ni Chromium, Cr Copper, Cu Manganese, Mn Molybdenum, Mo Niobium, Nb Silicon, Si Carbon, C Phosphorous, P Sulfur, S
Content (%) 35 32-38 19-21 3-4 ≤2 2-3 ≤1 ≤1 ≤0.07 ≤0.045 ≤0.035

Mechanical Properties :

The mechanical properties of nickel alloy 20 are displayed in the following table.

Properties Metric Imperial
Tensile strength (annealed) 620 MPa 89900 psi
Yield strength (annealed) 300 MPa 43500 psi
Elongation at break (annealed) 41% 41%


    The following are the list of applications of nickel 205 alloy:

  • Production of plastics and synthetic fibers
  • Chemical and petroleum processing equipment
  • Mixing tanks
  • Heat exchangers
  • Process piping
Work Process

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